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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting [Abstract]        
Number of operating segments     4  
Number of reportable segments     1  
Revenues from external customers        
Net Sales $ 200,238 $ 199,493 $ 368,330 $ 373,205
Americas
       
Revenues from external customers        
Net Sales 139,593 135,689 252,840 247,102
Europe, Middle East, Africa
       
Revenues from external customers        
Net Sales 39,838 43,414 79,029 87,218
Asia Pacific
       
Revenues from external customers        
Net Sales $ 20,807 $ 20,390 $ 36,461 $ 38,885